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_ . www.energylab.com Helena, Mt B77-472-0711 * Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />Ana"calExce9enceSince 1952 Gillette, WY 866-686-7175 • Rapid City, SD 888-672-1225 • College Station, TX 888-690-2218 <br />QA/QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: Cotter Corporation Report Date: 01/24/11 <br />Project: Schwartzwalder Water Sampling Program Discharge Work Order: C10120395 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: E903.0 Batch: RA226-5067 <br />Sample ID: C10120463-004AMS Sample Matrix Spike Run: BERTHOLD 770-1_101217B 12/29/10 14:00 <br />Radium 226 12 pCi/L 98 70 130 <br />Sample ID: C10120463-004AMSD Sample Matrix Spike Duplicate Run: BERTHOLD 770-1_101217B 12/29/10 14:00 <br />Radium 226 12 pCi/L 97 70 130 1.7 23.7 <br />Sample ID: MB-RA226-5067 3 Method Blank Run: BERTHOLD 770-1_101217B 12/29/10 16:10 <br />Radium 226 -0.1 pCi/L U <br />Radium 226 precision (±? 0.06 pCi/L <br />Radium 226 MDC 0.1 pCi/L <br />Sample ID: LCS-RA226-5067 Laboratory Control Sample Run: BERTHOLD 770-1_101217B 12/29/10 16:10 <br />Radium 226 5.7 pCi/L 93 70 130 <br />Method: E903.0 <br />Sample ID: C10110835-001FMS <br />Radium 226 <br />Sample ID: C1 0110835-001 FMSD <br />Radium 226 <br />Sample ID: MB-RA226-5063 <br />Radium 226 <br />Radium 226 precision (±) <br />Radium 226 MDC <br />Sample ID: LCS-RA226-5063 <br />Radium 226 <br />Sample Matrix Spike <br />12 pCi/L <br />Sample Matrix Spike Duplicate <br />15 pCi/L <br />3 Method Blank <br />0.03 pCi/L <br />0.07 pCi/L <br />0.1 pCi/L <br />Laboratory Control Sample <br />6.0 pCi/L <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />Batch: RA226-5063 <br />Run: TENNELEC-3_101216D 12/27/10 10:15 <br />89 70 130 <br />Run: TENNELEC-3_101216D 12/27/10 10:15 <br />107 70 130 17 24.1 <br />Run: TENNELEC-3_101216D 12/27/10 10:15 <br />U <br />Run: TENNELEC-3_101216D 12/27/10 10:15 <br />96 70 130 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />Page 16 of 22